Dyestuff preparations and process of making same



P atente d- May 28,1929.

UNITED STATES PATENT- OFFICE.

IBERTRAM MAYER AND HUGO SIEBENBURGER, BASEL, SWITZERLAND, ASSIGNORS T0SOCIETY OF CHEMICAL INDUSTRY IN. BASLE, OF BASEL, SWITZERLAND.

DYIESTUFF PREPARATIONS AND PROCESS OF MAKING SAME.

No Drawing. Application filed July 2, 1928, Serial No. 290,022, andiii-Switzerland July 12, 1927.

This invention relates to the mamit'aeture of new dyestuti'preparations, particularly suitable for the produetion of fast tints onthe fibre. It comprises the process of making these new preparations,and the new preparations themselves.

The rat dyestuii' known as iso-riolanthrone (Schultz, Farbstotltabellen,5th edition, No. 766) dyes cotton in unsightly brownish violet tints,whereas the so-ralled diehloroiso-violanthrone (Schultz No. 767) dyescotton vivid red violet tints.

This invention is based on the observation that when these. eompoundsare mixed together, whether by n1e .-.hanirally mixin them or byoxidation of a mixture of the corresponding leueo-eompounds in substanceor on the fibre, new noduets'are obtained which dye the libre violettints, the produetireness of which and, above all, their vividnessexceeds what would be expected from the dyeings of the imlividualeomponents. At the same time the dyeing 's obtained show a strong andquite surprising shifting of" the tint towards blue.

Obviously, it is possible to convert the new products intoleuco-preparations or leneo-ester salts and to use them in this form.

Thefollowing examples illustrate. the invention:

Example 1.

tained in any other manner, for instance by oxidizing a mixture of thecorresponding ltllt'l)-(f()IIlpOUHdS.

Similar: produets are obtained when the proportion in which the 2dyestufi's are mixed is varied in either direction.

Emample 2.

. lotton is dyed in the usual manner; for the d \,'estull's ot" theviolanthrone or isoriolanthrone series with a mixture from arts ofiso-violanthrone and :35 parts of diehloro-iso-violanthrone. There is,thus obtained a violet. that is quite considerably hluer, purer and morepowerful than the tint that; would be expected from the appearance of adyeing from 100 parts of isoviolanthrone and one from 100 parts ofdichloro-iso-violanthrone.

\Vhat we claim is:-- i

1'. As new products dyes-lull preparations consisting in a mixtureot"iso-violanthrono and dicl\hn-o-iso-violantlirone.

2. In the preparation of dyestutl' preparations the process consistingin mixing in violanthrone with. d ichloro-iso-violanthrone.

3. In the preparation o't dyestuli' preparations the process consistingin mixing iso-' violanthrone with dichlm'o-iso-Violanthrone by oxidizingtogether a mixture of the leueocompounds of said dyestuffs.

4. In the preparation of dyestutl' preparations the process consistingin mixing isoviolanthrone with diehlmgo-iso-violanthrone by oxidizingtogether a-inixture of the leneocompounds of said dyestutt' on textilematerial.

In witness whereof we have hereunto signed our names this 19th day ofJune,

BERTRAM MAYIgR. HUGO SIEBENBURGER.

